HV for all channels was updated before the beginning of e1 data taking and not changed.
1. Bad Channels
Sector 1 2 3 4 5 6
16R - 48AL 1L ADC 48AL 1R
44R 48B OFF 33R 48B OFF 30R ADC
45R
2. Gain Matching (Exceptions are about 2 channels per sector which were fixed and HV not updated
before run began):
Channel m.i.p. matching corresponds to 600 +/- 200 channels, +/- 100 channels in most cases.
Matching Between left and right sides: ratio = 1 +/- 0.5, +/- 0.2 in most cases.
Some systematic shifts are observed between the forward and back angles.
3. Time matching between channels is of the order of a few ns and updated in the map.
4. Matching of Tracks to TOF scintillator hits (Approximate averages, all tracks):
Sector 1 2 3 4 5 6
Panel 1 >90% 60-90% 60-90% >90% 90% 90%
Panel 2,3 >90% 90-70% 90-80% >80% 80-70% >70%
Panel 4 >70% >70% >75% >70% 65% 70%
From 50 events scanned that had no match: 40% no TOF hit, 40% poor tracking, 20% FA acceptance miss.
Notes: a) Find more misses for positive tracks b) misses seem to be correllated with triggering,
probably due to enhancement fraction of electrons vs protons, etc.